An eccentric man living alone in a decrepit house in Tokyo periodically transforms into a 100-foot tall giant in order to defend Japan against similarly sized monsters.
This inspired 2007 send-up of the atomic-monster genre gets a fair amount of comic mileage from Daisato (played by the director) being anything but a big man.
The movie doesn't get truly weird until the Power Ranger-style superheroes show up, and the special effects get even more low-rent. Then it really takes off.
Big Man Japanis built around a funny concept, vaguely akin to Hancock: its title character is a superhero who is a bit of a loser.Unfortunately, the concept is not enough to sustain entire the film.
At nearly two hours, Big Man Japan is clever (in a sick sort of way) but overlong. It needs judicious editing -- more mockumentary, fewer superhero antics.